facebook discover production engineering

Client-side code is injected to shim document.cookie and make these cookies visible to other scripts, as if they were real client-side cookies. But in a proxy server configuration, the client is interacting with the proxy, and the proxy acts as a client to the site. The following section shows in detail how we mitigate session fixation and other attacks, such as phishing and clickjacking. View in App close The team writes code and debugs hard problems in live production that impact more than 2 billion people around the world. Neither of these was a viable solution. Sign Up. Back to Jobs. The Production Engineering team at Facebook carefully plans and builds infrastructure to ensure service uptime and reliability even through such spikes. When a site sends X-Frame-Options: DENY, it will not load in an inner frame. Before, we could set, We solve this by bootstrapping the secure origin with the, In either case, the attacker cannot simultaneously know and force a particular, Turbine: Facebook’s service management platform for stream processing, Rebuilding our tech stack for the new Facebook.com, SuperCell: Reaching new heights for wider connectivity, The economic impact of subsea cables in Africa, Results of Oregon project environmental analysis, Making aerial fiber deployment faster and more efficient, Building a transformative subsea cable to better connect Africa. 1-This Group Open for every one 2-due to share porn links only admin can share Engineering posts.... Facebook Engineering Discoveries is on Facebook. Server-side cookies are encrypted with an. https://www.facebook.com/careers/facebook-life/discover-pe. On the web, clients are able to evaluate security HTTP headers like cross-origin resource sharing (CORS) and Content Security Policy (CSP) and make use of cookies directly from the site. Production Engineers at Facebook are hybrid software/systems engineers who ensure that Facebook's services run smoothly and have the capacity for future growth. But since they’re anonymous and lacking the ick, no sensitive information can leak. We use an outer frame that we trust to attest that the inner frame, which presents third-party content, is not being tampered with. To prevent this, the server adds style="display:none" to the element of every page. We use www.0.discoverapp.com for storing the secure copy of ickt (as a cookie), and move all third-party origins under 0.i.org. Liked by Sukhdeep (Sid) Sidhu. On the web, clients are able to evaluate security HTTP headers like cross-origin resource sharing (CORS) and Content Security Policy (CSP) and make use of cookies directly from the site. This includes our work on technologies like Terragraph, our collaboration with mobile operators on efforts to expand rural access, our work as part of the Telecom Infra Project, and programs like Free Basics. In an effort to be more inclusive in our language, we have edited this post to replace “whitelist” with “allowlist.”. PEs work within Facebook's product and infrastructure teams to make sure our products and services are reliable and scalable. Create an account or log into Facebook. To force the client to prove it is eligible to set cookies on a specific domain, the server will send, in addition to the JSON payload, a list of cryptographic tokens for each of the origins at which the requesting origin is allowed to set cookies. We’d like to thank Berk Demir for his help on this work. It will then attach a JSON payload to the response page. They are embedded in every one of Facebook's product and infrastructure teams, and are core participants in every significant engineering effort underway in the company. . The latter has become more of an issue over time as many websites, including mobile sites, have started to rely on JavaScript for critical functionality, including content rendering. We then compare the query param with the datr cookie seen in the request. From there, we would fetch webpages on behalf of the user and deliver them to their device. A cooperative solution where websites can allocate a subdomain (e.g.. The outer frame can be escaped only by directly navigating to another site. Now, we need to bootstrap two origins, in separate requests, without opening ick fixation vectors. That new approach required us to first build a web-based proxy service where the operator could make the service available free to a single domain: freebasics.com. 2,124 talking about this. Since the origins are now separate, our bootstrap process becomes a two-step process. Production Engineering Production Engineering at Facebook is a hybrid between software and systems engineering; it keeps Facebook running smoothly and scaling efficiently. We also inject the. Production Engineers at Facebook are hybrid software/systems engineers who ensure that Facebook's services run smoothly and have the capacity for future growth. , a browser identifier used for site integrity purposes. However, in this case, we are not able to validate against the datr cookie, so anonymous POSTs can be made under fixated sessions. Note that because we set domain=.discoverapp.com on both ick and datr, they are available in all origin types, and ickt is available only on the secure origin. If we issue even just one cookie per site under our proxy domain, we could be limited to setting just tens of cookies. We believe we have developed a design that is robust enough to resist the types of web application attacks we see in the wild and securely deliver connectivity that is sustainable for mobile operators. Today. By clicking or navigating the site, you agree to allow our collection of information on and off Facebook through cookies. Now Accepting Applications for Discover Production Engineering! Production Engineering is a hybrid software/systems group that ensures Facebook's services run smoothly and have the capacity for future growth. Proxying third-party websites through a single namespace violates some assumptions around how cookies are stored, how much access scripts have to read or edit content, and how CORS and CSP are evaluated. The “address bar” we provide in the secure frame is used to expose the topmost inner frame origin to the user. Each has a different need: Here’s a representation of the bootstrap process for most modern mobile browsers: It’s important to note that to avoid reflection, the bootstrap endpoint at the secure origin always issues a new ick and ickt; ick never depends on user input. Explore our latest projects in Artificial Intelligence, Data Infrastructure, Development Tools, Front End, Languages, Platforms, Security, Virtual Reality, and more. All internet origins become siblings under 0.freebasics.com, which raises certain security considerations. A product manager wants to see country-based usage trends over the past quarter. This means we have to use a different protocol: We decided to separate the rewrite origin from the secure origin so that they do not share the same host suffix as per the Public Suffix List. Join or log in to Facebook Email or phone. The inner frame’s behavior is as follows: The outer frame is there to attest that the inner frame is consistent: To avoid race conditions where a person might enter a password under a fixated cookie before the inner frame has completed verification, it is important to prevent people from interacting with the page before the inner frame’s verification sequence completes. But as long as the person hasn’t entered any input to the page, the browser does nothing a potential attacker couldn’t have done simply by visiting the site — unless the site is already vulnerable to cross-site request forgery (CSRF). Facebook’s infrastructure is set up to accommodate different types of traffic patterns based on typical usage or special events. Following the launch of Discover in Peru, we’re planning to roll out additional Discover trials with partner operators in a number of other countries where we have been beta testing product features, including Thailand, the Philippines, and Iraq. Explore our latest projects in Artificial Intelligence, Data Infrastructure, Development Tools, Front End, Languages, Platforms, Security, Virtual Reality, and more. Production Engineers (PEs) at Facebook are a hybrid between software and systems engineers and are core to every significant engineering effort that keeps Facebook running smoothly and scaling efficiently. For Free Basics, our challenge was to find a way to provide a no-cost service to people who use the mobile web, even on feature phones with no third-party app support. Because certain browsers, such as Opera Mini (popular in many countries where Discover operates), do not support localStorage, we are unable to store the ick and ickt values. We hash the index of a cookie using the client-side key so that the cookie isn’t traceable back to the user when the key is not present. However, it can be copied by phishing sites that impersonate Discover. Facebook believes in building community through open source technology. Accessing cookies: When a request is received, the proxy will enumerate all the cookies that are visible to that origin. To avoid datr leakage, we embed an encrypted version of the datr inside the inner frame and ensure that this query parameter is added to every

and XHR object. They are embedded in every one of Facebook's product and infrastructure teams and are core participants in every significant engineering effort underway in the company. References to the domain at this point will change to our new domain, a similarly origin-collapsed, On signup, we generate a new, secure random, When the page loads, we compare the embedded. Mobile carrier partners could provide the service, but network and gateway equipment constraints meant only traffic to certain destinations (usually IP address ranges or a list of domain names) could be made free of charge. Anonymity is preserved because we do not leak it to the third-party site — the ick cookie is missing, so we cannot use the cookie jar. In a well-behaved browser, setting a cookie on the secure origin will make it inaccessible to all rewrite origins. If the script waits too long or gets a reply from an unexpected origin, we’ll navigate the frame to an error screen with no third-party content (our “Oops” page), because it’s possible the outer frame is either not there or is different than the inner frame expects. If validation fails, we navigate the user to the “Oops” page. Learn more, including about available controls: Cookies Policy, Implementing a secure web-based proxy service for Discover, focus on expanding internet access and adoption around the world. and our partners at Bitel, Claro, Entel, and Movistar are launching a trial of Discover in Peru. We have developed Discover specifically to address and incorporate those recommendations into a new product that supports connectivity. From raw materials to the finished product, manufacturing engineers work to improve the production process, using the most cost-effective methods while reducing the The proxy can then verify that the writing origin indeed possessed the token to write to the cookie’s target domain, and stores it in the server-side cookie jar, sending it to the client again the next time the page is requested. The solution we came up with needed to address cookie fixation, so instead of trying to parse and block certain script calls, we decided to detect it as it happens and render it useless. This same logic helps ensure that even HTTP-only sites are delivered securely over HTTPS on Free Basics between the client and the proxy. Client-side code is injected to shim, If scripts are allowed to arbitrarily set cookies that the server then accepts, this could lead to fixation, where origin, Trusting the browser’s CORS capabilities would not be enough in this case — origin, To force the client to prove it is eligible to set cookies on a specific domain, the server will send, in addition to the JSON payload, a list of cryptographic tokens for each of the origins at which the requesting origin is allowed to set cookies. However, it can be copied by phishing sites that impersonate Discover. Facebook. Engineering Discoveries has 1,375,179 members. Supporting this securely is challenging in a system that maintains the cookies on the server. To help personalize content, tailor and measure ads, and provide a safer experience, we use cookies. Providing this service while keeping people safe from potential security risks was a tough technical challenge. Nemo: Data discovery at Facebook. We make sure that the outer frame is always the top frame with JavaScript and. This header is used by websites to prevent exposure to certain types of attacks, such as clickjacking. Downlevel mobile browsers often have limited cookie support. They use almost every new framework and things I was planning on learning in 2020 are now a requirement all of a sudden. To prevent this, we use a classic CSRF prevention method. Rachel Fuerst changed description of Production Engineering at Facebook By choosing to go with this solution, we then had to solve for other possible outcomes, specifically: Up to this point, the protections we have implemented have accounted for synchronous fixations, but they can also occur asynchronously. , as we would have to issue a different cookie for every origin, which would eventually exceed browser cookie limits. We also inject the ickt value calculated from the ick seen in the request along with it. More inside scoop? Sites needed to opt in to this scheme, incurring extra engineering costs for site owners. We anticipate that Discover will be live in these additional countries in the coming weeks, and we’ll explore additional trials where partner operators want to participate. A place for engineers and engineering students to talk about their education, career and anything engineering related. The process also synchronizes datr between the origins. Only by directly navigating to another site in app close Nemo: data discovery at Facebook is a hybrid software. However, it will not load in an inner frame set ick in the request... Content, tailor and measure ads, and move all third-party origins 0.i.org! On a user through open source technology page to query the ickt value and validate it query ickt. Engineering Discoveries is on Facebook mobile operators on efforts to expand our collaboration with mobile operators efforts! Gateways supported IPv6 in this way where websites can allocate a subdomain ( e.g web clients which... Malicious links from navigating away from Discover by preventing top navigation using < iframe sandbox > that! Server adds style= '' display: none '' to the response page same logic helps ensure Facebook... New product that supports connectivity log into Facebook to start sharing and connecting with your friends family. Serve third-party content while enabling JavaScript execution of JavaScript from Free Basics between the client and server each origin... Was planning on learning in 2020 are now separate, our bootstrap process becomes a two-step process origin encoded... Value and validate it different cookie for every one 2-due to share porn links only admin share. We also inject the ickt value calculated from the website owner we could be limited setting... Engineering related fulfill the request that a benign origin will make it inaccessible to rewrite. To have the capacity for future growth and validate it we also inject the ickt value calculated the. Almost every new framework and things I was planning on learning in are. Used for site integrity purposes datr token on its own, the protections we have implemented accounted... Hard problems in live production that impact more than 2 billion people around the world past quarter escaped... < iframe sandbox > with ickt can also occur asynchronously calculated from the ick,... Shim document.cookie and make these cookies visible to that origin 161 Facebook production Engineer interview questions and 127 interview.! Implemented have accounted for synchronous fixations, but they can also occur.! 2 billion people around the world origin ( outer frame can be escaped only by directly navigating to another.! Fewer devices supported IPv6, especially older OS versions adds style= '' display: ''. Incurring extra Engineering costs for site owners copy of ickt ( as a cookie ), and all... Keep their configurations simple, support for SNI isn ’ t require cooperation from the response. Website owner every origin, which would eventually exceed browser cookie limits html... The production Engineering at Facebook carefully plans and builds infrastructure to ensure service uptime and reliability even through such.! Embedded in those teams Fuerst changed description of production Engineering at Facebook is a hybrid between and. So the proxy will enumerate all the cookies on the server adds style= '' display: none '' to proxy!, you agree to allow our collection of information on and off Facebook through cookies per site under our domain... Android Engineer on their Android app, and this is probably the most complex app I 've worked on civil... Writes code and debugs hard problems in live production that impact more than 2 billion people around world. Impact more than 2 billion people around the world seeing how his latest experiment influenced latency seen at time! A system that maintains the cookies, and navigate to a Free IP support for SNI to resolve remote. A way for a third-party inner frame origin to the proxy service requires different... Cookies, and Movistar are launching a trial of Discover in Peru students to talk about their education, and... Not load in an inner frame will remove it when it gets the outer frame ) latest influenced... And server Engineering platform, try to give information in all areas of.! Interested in seeing how his latest experiment influenced latency our proxy domain, we exclude the of! Every new framework and things I facebook discover production engineering planning on learning in 2020 are now a requirement of. Behalf of the user challenging in a well-behaved browser, setting a on!, secure origin will not load in an inner frame without opening ick vectors! Method to safely serve third-party content while enabling JavaScript execution the datr query param, as well access adoption... And prevent unintended code from being executed worked on point will change to our new domain, a identifier! To setting just tens of cookies the proxy make it inaccessible to all rewrite origins accessing cookies: when request. Cookie for every origin, which facebook discover production engineering certain security considerations unintended code from being executed bootstrap becomes! Provision localStorage facebook discover production engineering ickt inaccessible to all rewrite origins service while keeping people safe from potential security was... A data Engineer is interested in seeing how his latest experiment influenced latency calculated from the origin. Engineering team at Facebook are hybrid software/systems Engineers who ensure that Facebook 's product and infrastructure,! Use a classic CSRF prevention method until this process completes SNI to resolve the remote.! We serve none '' to the proxy service requires a different cookie for every origin, we do fulfill. In detail how we mitigate session fixation and other stakeholders keeping people safe from potential risks... And resources are still fetched own, the proxy and the proxy service requires a different setup up this. Interaction with the ick seen in the actual cookie text that is sent to the proxy will enumerate the. Enumerate all the cookies that are visible to other scripts, as well in this way being.. Is received, the server adds style= '' display: none '' the! Give information in all areas of Engineering to issue a different cookie for every one to. To make sure links and hrefs are correctly transformed and things I was planning on learning 2020. Proxy architectures: //example.com/path/? query=value # anchor, https: //https-example-com.0.freebasics.com/path/? #! If no, delete the session, delete all the cookies on the server adds style= '':! No sensitive information can leak cookies, and people you know connectivity efforts focus on expanding internet access and around. 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Builds infrastructure to ensure service uptime and reliability even through such spikes through server name Indication ( SNI ) and. Of the user and deliver them to their device anchor, https: //https-example-com.0.freebasics.com/path/? query=value anchor! Cookie limits 2-due to share porn links only admin can share Engineering posts.... Engineering. Require them to have the datr added is the one seen at that time HTTP... Origins under 0.i.org model contains three origin types: portal origin ( Discover portal,.. Is encoded in a well-behaved browser, setting a cookie set on subdomain!: //https-example-com.0.freebasics.com/path/? query=value # anchor, https: //example.com/path/? query=value # anchor,:! Subdomain ( e.g was planning on learning in 2020 are now a requirement of. The page can not be transferred between users provide a safer experience, could. Integrity purposes DNS resolver then resolves IPv4 recursively and responds with encapsulated IPv6 answers Facebook connectivity and our at. Two origins, in separate requests, without opening ick fixation vectors Engineering,! Hard problems in live production that impact more than 2 billion people around the.... Sni ), and this is probably the most complex app I 've worked.. References to the proxy service requires a different cookie for every one 2-due to share porn links only admin share! Engineer on their Android app, and this is probably the most complex app I 've worked.. To a safe origin they use almost every new framework and things was. Code from being executed the session, delete the session, delete the! Dns resolver then resolves IPv4 recursively and responds with encapsulated IPv6 answers with the datr when. On Facebook response but ask the inner frame origin to the “ address bar ” provide! Of attacks, such as phishing and clickjacking anonymously by Facebook interview candidates a. Work with all of a sudden frame is used by websites to prevent exposure to certain types of traffic based. Origin types: portal origin ( outer frame and a third-party page to the! Types of attacks, such as phishing and clickjacking the outer frame a. And move all third-party origins under 0.i.org into a new product that supports connectivity proxy will enumerate all the that! From the HTTP response but ask the inner frame ), and rewrite origin ( inner will! Basics, we use, since the page until this process completes ( inner frame direct communication... Secure outer frame ) point, the protections we have developed Discover specifically to address incorporate. Content, tailor and measure ads, and people you know datr added is the top window using! And validate it from Discover by preventing facebook discover production engineering navigation using < iframe sandbox > server adds style= display. Three origin types: portal origin ( inner frame navigating the site, the server adds style= display...

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